Buddhist monks usually wear saffron robes and remain celibate — but not Geshe Michael Roach, 57, who wears Armani suits, dances at Cielo, and enjoys “joining” with female followers. “We [monks] are not allowed to have sex, but in yoga there are practices that involve joining with a partner,” Roach explains to Page Six Magazine, free in tomorrow’s New York Post. “They are secret . . . You might think of them as sex, but their purpose is to move inner energy. It takes very strict training. There would be penetration, but no release of semen.” As for his disco dancing: “If we don’t make it fun and healthy, Buddhism will die out.”